DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 261708
SWODY2
SPC AC 261705

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1205 PM CDT FRI SEP 26 2008

VALID 271200Z - 281200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
UPPER TROUGH/LOW LINGERING OVER THE ERN U.S. IS FORECAST TO WEAKEN
-- AND EVENTUALLY PHASE WITH -- A SHORT-WAVE TROUGH IN THE WLYS
CROSSING THE UPPER GREAT LAKES REGION. AS THIS TROUGH MOVES INTO
ERN CANADA DURING THE SECOND HALF OF THE PERIOD...IT SHOULD MERGE
WITH THE WEAKENING ERN TROUGH AND SHIFT SLOWLY EWD THROUGH THE END
OF THE PERIOD.

ELSEWHERE...A SECOND SHORT-WAVE TROUGH WITHIN THE FASTER BELT OF
MID-LEVEL WLYS SHOULD MOVE ACROSS WRN CANADA AND EVENTUALLY INTO THE
PRAIRIE PROVINCES...WHILE ALSO BRUSHING THE PAC NW/MT THROUGH THE
PERIOD.

AT THE SURFACE...BROAD AREA OF LOW PRESSURE OVER THE ERN CONUS
SHOULD WEAKEN WITH TIME...WHILE A WEAK COLD FRONT MOVING ACROSS THE
UPPER GREAT LAKES/UPPER MIDWEST ALSO WEAKENS. A SECOND COLD FRONT
-- ASSOCIATED WITH THE WRN CANADA UPPER SHORT-WAVE TROUGH -- SHOULD
MOVE ACROSS MT...WITH A LEE TROUGH EXTENDING SWD ALONG THE FRONT
RANGE OF THE ROCKIES.

ALONG WITH SCATTERED SHOWERS AND STORMS OVER THE SRN HALF OF
FL...CONVECTION WILL ALSO AFFECT PARTS OF THE NORTHEAST/MID AND
UPPER OH VALLEY REGION INVOF THE WEAKENING STORM SYSTEM ACROSS THIS
REGION.

ELSEWHERE...ISOLATED TO SCATTERED SHOWERS AND STORMS WILL BE
POSSIBLE FROM THE UPPER GREAT LAKES SWWD ACROSS THE MID MO
VALLEY...INVOF WEAKENING FRONT. ISOLATED STORMS ARE ALSO
ANTICIPATED ACROSS PARTS OF THE SOUTHWEST/FOUR CORNERS REGION...AND
NEWD ALONG THE FRONT RANGE OF ERN CO/ERN WY. AS A LOW-LEVEL JET
DEVELOPS OVER THE PLAINS OVERNIGHT...A FEW STORMS MAY
MIGRATE/DEVELOP EWD FROM THE HIGHER TERRAIN INTO PARTS OF SD/NEB.

WHILE A FEW STRONGER CELLS MAY BE POSSIBLE INVOF THE WEAKENING FRONT
OVER THE PLAINS/UPPER MIDWEST DURING THE AFTERNOON/EVENING...OVERALL
SEVERE POTENTIAL APPEARS LOW ACROSS THE CONUS. THEREFORE...WILL NOT
HIGHLIGHT ANY THREAT AREAS THIS FORECAST.

..GOSS.. 09/26/2008

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